Fixes cit

Author: sobolevn

returns/_generated/pipeline/flow.py

@@ -1,8 +1,7 @@
 # -*- coding: utf-8 -*-
 
-from functools import reduce
-
-from returns._generated.pipeline import pipe
+# We import from the source, becase otherwise we will have a circular import.
+from returns._generated.pipeline.pipe import _pipe
 
 
 def _flow(instance, *functions):
@@ -30,4 +29,4 @@ def _flow(instance, *functions):
         - https://github.com/gcanti/fp-ts/blob/master/src/pipeable.ts
 
     """
-    return pipe._pipe(*functions)(instance)
+    return _pipe(*functions)(instance)

returns/pipeline.py

@@ -2,14 +2,17 @@
 
 from typing import Union
 
-from returns._generated.pipeline.pipe import _pipe as pipe  # noqa: F401
 from returns._generated.pipeline.flow import _flow as flow  # noqa: F401
-from returns._generated.pipeline.pipeline import _pipeline as pipeline  # noqa: F401
+from returns._generated.pipeline.pipe import _pipe as pipe  # noqa: F401
 from returns.io import IOResult
 from returns.maybe import Maybe
 from returns.primitives.exceptions import UnwrapFailedError
 from returns.result import Result
 
+from returns._generated.pipeline.pipeline import (  # isort:skip  # noqa: F401
+    _pipeline as pipeline,
+)
+
 # Logical aliases:
 _Unwrapable = Union[Result, Maybe, IOResult]
 
@@ -34,6 +37,9 @@ def is_successful(container: '_Unwrapable') -> bool:
       >>> is_successful(Failure(1))
       False
 
+    This function can work with containers that support
+    :class:`returns.primitives.interfaces.Unwrapable` protocol.
+
     """
     try:
         container.unwrap()